Yikes, I had my wires crossed. I was thinking in my head of another fish when I thought A. japonicus. I just realized were talking about the Powder Brown. This fish is delicate, and in general a poor aquarium fish. I say this speaking in relative terms, for that are much hardier, easier to acclimate surgeons to choose from. While it may be more suitable in the temperament department than other species as indicated above, it's not attractive enough to be worth the trouble IMO. Only A. leucosternon is more trouble, and both should be avoided unless you're just looking for a hassle. I've kept A. japonicus successfully as have others, but most of them that go home with hobbiests die fairly quickly.
I'm partial to the Zebrasomas for a few reasons, not the least of which is hardiness. My favorite Naso species by far is lituratus, and if I were you this would be my choice in this situation. Can't beat them in my experience.
Jim